Verified answer

Ответ:

x, y = (23, 19)

[tex]\left \{ {{x-y=4} \atop {x^{2}-y^{2}=168}} \right.[/tex]

 x=4+y

{

 x^2-y^2=168

(4+y)^2-y^2=168

16+8y+y^2-y^2=168

16+8y=168

8y=152

y=19

x-19=4

x=23